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JIT64: Optimize cmpXX 

Use TEST instead of CMP if we're comparing against 0 (rather common), and
optimize the case of immediate compares further.
This commit is contained in:
Fiora 2014-08-24 11:24:27 -07:00
parent de662a79b7
commit faf6bdfd96
1 changed files with 38 additions and 10 deletions
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48
Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
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@ -460,12 +460,13 @@ void Jit64::cmpXX(UGeckoInstruction inst)
}
else
{
X64Reg input = RSCRATCH;
if (signedCompare)
{
if (gpr.R(a).IsImm())
MOV(64, R(RSCRATCH), Imm32((s32)gpr.R(a).offset));
MOV(64, R(input), Imm32((s32)gpr.R(a).offset));
else
MOVSX(64, 32, RSCRATCH, gpr.R(a));
MOVSX(64, 32, input, gpr.R(a));
if (!comparand.IsImm())
{
@ -476,19 +477,46 @@ void Jit64::cmpXX(UGeckoInstruction inst)
else
{
if (gpr.R(a).IsImm())
MOV(32, R(RSCRATCH), Imm32((u32)gpr.R(a).offset));
{
MOV(32, R(input), Imm32((u32)gpr.R(a).offset));
}
else if (comparand.IsImm() && !comparand.offset)
{
gpr.BindToRegister(a, true, false);
input = gpr.RX(a);
}
else
MOVZX(64, 32, RSCRATCH, gpr.R(a));
{
MOVZX(64, 32, input, gpr.R(a));
}
if (comparand.IsImm())
MOV(32, R(RSCRATCH2), comparand);
{
// sign extension will ruin this, so store it in a register
if (comparand.offset & 0x80000000U)
{
MOV(32, R(RSCRATCH2), comparand);
comparand = R(RSCRATCH2);
}
}
else
MOVZX(64, 32, RSCRATCH2, comparand);
comparand = R(RSCRATCH2);
{
gpr.BindToRegister(b, true, false);
comparand = gpr.R(b);
}
}
if (comparand.IsImm() && !comparand.offset)
{
MOV(64, PPCSTATE(cr_val[crf]), R(input));
// Place the comparison next to the branch for macro-op fusion
if (merge_branch)
TEST(64, R(input), R(input));
}
else
{
SUB(64, R(input), comparand);
MOV(64, PPCSTATE(cr_val[crf]), R(input));
}
SUB(64, R(RSCRATCH), comparand);
MOV(64, PPCSTATE(cr_val[crf]), R(RSCRATCH));
if (merge_branch)
{